Well, I said no, but I kind of grew up in one. I mean, I was the only student, but still.
On the whole, if you can't have the fortune (good or bad, you decide - I love my job, but I'll always be poor) to be born into the family of a luthier, I think they are a pretty good idea, but do not for one second imagine that you will come out a fully qualified repair person or builder. The school can give you some basic skills, and that is great, but it's not enough. For the last 25 years or so, we have hired all but one of our employees from the Minnesota State College Red Wing Tech Instrument Repair school. After we get them, it takes about 5 years for them to be competent, and at least 10 for them to be first rate. A few of them, who were exceptionally talented, cut that 10 years down to 7-8, but they are the exception.
The way I see it, it take about 100 fret dresses before you are reliable on that one, and doing a professional setup for someone else is hard too. The real thing, though, is the structural repair jobs. Gluing and cleating top cracks is pretty easy, but getting the back on a 20's or 30's Gibson mandolin that has sprung? (The backs shrink, and the sides kind of spring outwards, so nothing fits anymore.) Or getting a perfect fit and grain match on a patch in a neck? That takes a lot of practice. And then, for the truly master level of repair, you do that kind of stuff on really valuable vintage guitars, which means you have to do all that stuff with hide glue. Gluing up a neck reset with Tightbond isn't that hard. Gluing up a Neck reset with hide glue is a whole other thing. And regluing that back with hide glue? You don't even want to think about it until you've been doing this shit for 15 years or more.
So if this is something you really want to do for the rest of your life, then absolutely go to a school. Hell, if you just want to build an instrument for fun, go to one of the schools. They do that too. Just don't expect to come out of one of them an expert.
Light
"Cowards can never be moral."
M.K. Gandhi